Induction-coil.



No, 688,9l5. Patented nec. I7, |9ol. y

, n. H. wlLsnN;

INDUCTIUN COIL.

(Application led Mar. 28, 1901.)

(No Modal.)

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UNITED STATES j PATENT OFFICE..

lDAVID H. WILSON, OF CHICAGO, ILLINOIS.

INDUCTION-COIL.

SPECIFICATION forming part of Letters Patent No. 688,915, dated December17, 1901.

' Application tiled March 28, 1901. Serial No. 53,270. (No model.)

fo all whom, it may concern.-

Be it known that I, DAVID H. WILSON, va citizen of the United States,residing at-Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in`Induction-Coils,ofwhich the following is a specification.

Myinvention relates to induction-coils, and has for its object toprovide a new and improved induction-coil particularly adapted to beused in connection With telephone systems.

`tionon line 2 2, `ig. 1.

v completely surrounded by and sealed up in a non-conducting box or abox of non-magnetic material.

In order to make my invention clear,I have illustrated a particular formor construction; but it is of course evident that the form,construction, and arrangement of the'parts may be greatly varied.

As illustrated in the drawings, I provide a box A of some suitablenon-magnetic material. This box may be made in anydesired manner, andthe parts may be assembled'in any Way desired. As herein shown, the boxconsists of two end plates B, connected Vtogether by the side pieces Cand the bottom piece D, said latter pieces being preferably integralwith. the end plates. The box is iilled with a series of small bars orpieces or Wires' of magnetic material E, which forms the laminated coreof the induction-coil, and a cover Fis provided, which seals the box,preferably hermetically. The end plates B preferably project beyond theexterior surface of the box-that is, the top, sides, and bottom-andserve to hold the coils in position. The pri- 5o mary and secondarycoils G and H are wound about the box, as shown, and are connected tosuitable binding-posts I and J. I prefer to form the coreof a series ofshort pieces, so that the length of the core Will be much less than thewidth. The several pieces constituting the laminated core are simplyfilled into the box in making the device, and when the box is full thelid is placed in position and preferably sealed,v so as to form a tightcompartment.

I have found that when-this construction is used to make coils fortelphone systems I can obtain results which greatly exceed the resultsobtainable from .the vordinary induction-coils used for this'purpose. Y

vI claim- 1. VAn induction-coil, comprising a box of non-magneticmaterial, a series of comparatively short pieces of Ymagnetic materialcontained in said box and forming a laminated core, said pieces ofmagnetic kmaterial running substantially parallel to the short dimensionof the box and a primary and secondary coil Wound about said box.

2. An induction-coil, comprising a laminated core consisting of aseriesof pieces of magnetic material, a holding or receiving device therefor,having end pieces or plates of nonrnagnetic material against which theends of the pieces which form the core abut, the distance between theend plates forming the .short dimension of the box and a primary andsecondary coil wound yabout said core.

3. Aninduction-coil, comprising a box of non -magnetic material, aseries of pieces of magnetic material contained therein andv forming-alaminated core, the ends of said pieces abutting against the ends of thebox, said ends formed of plates which project past the exterior boundaryof the box, and a primaryy and secondary coil Wound Within the spaceformed by said projecting ends.

DAVID II. WILSON.

